[shared_preferences] driver test using package:test on device (flutte…

…r#1285)

* Add SharedPreference example driver test

packages/shared_preferences/example/pubspec.yaml

@@ -7,5 +7,10 @@ dependencies:
   shared_preferences:
     path: ../
 
+dev_dependencies:
+  flutter_driver:
+    sdk: flutter
+  test: any
+
 flutter:
   uses-material-design: true

packages/shared_preferences/example/test/shared_preferences.dart

@@ -0,0 +1,93 @@
+import 'dart:async';
+import 'package:flutter_driver/driver_extension.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  final Completer<String> completer = Completer<String>();
+  enableFlutterDriverExtension(handler: (_) => completer.future);
+  tearDownAll(() => completer.complete(null));
+
+  group('$SharedPreferences', () {
+    const Map<String, dynamic> kTestValues = <String, dynamic>{
+      'flutter.String': 'hello world',
+      'flutter.bool': true,
+      'flutter.int': 42,
+      'flutter.double': 3.14159,
+      'flutter.List': <String>['foo', 'bar'],
+    };
+
+    const Map<String, dynamic> kTestValues2 = <String, dynamic>{
+      'flutter.String': 'goodbye world',
+      'flutter.bool': false,
+      'flutter.int': 1337,
+      'flutter.double': 2.71828,
+      'flutter.List': <String>['baz', 'quox'],
+    };
+
+    SharedPreferences preferences;
+
+    setUp(() async {
+      preferences = await SharedPreferences.getInstance();
+    });
+
+    tearDown(() {
+      preferences.clear();
+    });
+
+    test('reading', () async {
+      expect(preferences.get('String'), isNull);
+      expect(preferences.get('bool'), isNull);
+      expect(preferences.get('int'), isNull);
+      expect(preferences.get('double'), isNull);
+      expect(preferences.get('List'), isNull);
+      expect(preferences.getString('String'), isNull);
+      expect(preferences.getBool('bool'), isNull);
+      expect(preferences.getInt('int'), isNull);
+      expect(preferences.getDouble('double'), isNull);
+      expect(preferences.getStringList('List'), isNull);
+    });
+
+    test('writing', () async {
+      await Future.wait(<Future<bool>>[
+        preferences.setString('String', kTestValues2['flutter.String']),
+        preferences.setBool('bool', kTestValues2['flutter.bool']),
+        preferences.setInt('int', kTestValues2['flutter.int']),
+        preferences.setDouble('double', kTestValues2['flutter.double']),
+        preferences.setStringList('List', kTestValues2['flutter.List'])
+      ]);
+      expect(preferences.getString('String'), kTestValues2['flutter.String']);
+      expect(preferences.getBool('bool'), kTestValues2['flutter.bool']);
+      expect(preferences.getInt('int'), kTestValues2['flutter.int']);
+      expect(preferences.getDouble('double'), kTestValues2['flutter.double']);
+      expect(preferences.getStringList('List'), kTestValues2['flutter.List']);
+    });
+
+    test('removing', () async {
+      const String key = 'testKey';
+      preferences
+        ..setString(key, kTestValues['flutter.String'])
+        ..setBool(key, kTestValues['flutter.bool'])
+        ..setInt(key, kTestValues['flutter.int'])
+        ..setDouble(key, kTestValues['flutter.double'])
+        ..setStringList(key, kTestValues['flutter.List']);
+      await preferences.remove(key);
+      expect(preferences.get('testKey'), isNull);
+    });
+
+    test('clearing', () async {
+      preferences
+        ..setString('String', kTestValues['flutter.String'])
+        ..setBool('bool', kTestValues['flutter.bool'])
+        ..setInt('int', kTestValues['flutter.int'])
+        ..setDouble('double', kTestValues['flutter.double'])
+        ..setStringList('List', kTestValues['flutter.List']);
+      await preferences.clear();
+      expect(preferences.getString('String'), null);
+      expect(preferences.getBool('bool'), null);
+      expect(preferences.getInt('int'), null);
+      expect(preferences.getDouble('double'), null);
+      expect(preferences.getStringList('List'), null);
+    });
+  });
+}

packages/shared_preferences/example/test/shared_preferences_test.dart

@@ -0,0 +1,11 @@
+import 'package:flutter_test/flutter_test.dart';
+
+import '../lib/main.dart';
+
+void main() {
+  testWidgets('SharedPreferences example widget test',
+      (WidgetTester tester) async {
+    await tester.pumpWidget(MyApp());
+    expect(find.text('SharedPreferences Demo'), findsOneWidget);
+  });
+}

packages/shared_preferences/example/test_driver/shared_preferences_test.dart

@@ -0,0 +1,12 @@
+import 'package:flutter_driver/flutter_driver.dart';
+import 'package:test/test.dart';
+
+void main() {
+  test('SharedPreferences', () async {
+    final FlutterDriver driver = await FlutterDriver.connect();
+    await driver.requestData(null, timeout: const Duration(minutes: 1));
+    if (driver != null) {
+      driver.close();
+    }
+  });
+}

packages/shared_preferences/pubspec.yaml

@@ -19,6 +19,9 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  flutter_driver:
+    sdk: flutter
+  test: any
 
 environment:
   sdk: ">=2.0.0-dev.28.0 <3.0.0"